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Direct Determination of Spatial Localization of Carriers in CdSe-CdS Quantum Dots
KTH Royal Institute of Technology, Sweden.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.ORCID iD: 0000-0002-3186-6507
RISE, Swedish ICT, Acreo.
KTH Royal Institute of Technology, Sweden.
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2015 (English)In: Journal of Nanomaterials, ISSN 1687-4110, E-ISSN 1687-4129, Vol. 2015, article id 321354Article in journal (Refereed) Published
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Abstract [en]

Colloidal quantum dots (QDs) have gained significant attention due to their tunable band gap, simple solution processability, ease of scale-up, and low cost. By carefully choosing the materials, core-shell heterostructure QDs (HQDs) can be further synthesized with a controlled spatial spread of wave functions of the excited electrons and holes for various applications. Many investigations have been done to understand the exciton dynamics by optical characterizations. However, these spectroscopic data demonstrate that the spatial separation of the excitons cannot distinguish the distribution of excited electrons and holes. In this work, we report a simple and direct method to determine the localized holes and delocalized electrons in HQDs. The quasi-type-II CdSe-CdS core-shell QDs were synthesized via a thermolysis method. Poly(3-hexylthiophene) (P3HT) nanofiber and ZnO nanorods were selected as hole and electron conductor materials, respectively, and were combined with HQDs to form two different nanocomposites. Photoelectrical properties were evaluated under different environments via a quick and facile characterization method, confirming that the electrons in the HQDs were freely accessible at the surface of the nanocrystal, while the holes were confined within the CdSe core.

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Hindawi Publishing Corporation, 2015. Vol. 2015, article id 321354
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Nano Technology Electrical Engineering, Electronic Engineering, Information Engineering
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URN: urn:nbn:se:ri:diva-172DOI: 10.1155/2015/321354Scopus ID: 2-s2.0-84941255127OAI: oai:DiVA.org:ri-172DiVA, id: diva2:939518
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Publication no: A3584

Available from: 2016-06-20 Created: 2016-06-07 Last updated: 2019-07-03Bibliographically approved

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Sugunan, Abhilash

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